The official description of the R109 from the Roads Act 1993 (Classification of Regional Roads) Order 2006[1] reads:

R109: Lucan - Wolfe Tone Quay, Dublin

Between its junction with R112 at Kylemore Road and its junction with N4 at Frank Sherwin Bridge via Lucan Road, Anna Livia Bridge Chapelizod, Conyngham Road, Parkgate Street and Wolfe Tone Quay all in the city of Dublin.